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multi-threaded alpha encoding for lossy

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new option: 'cwebp -mt ...'
new config flag: config.thread_level
(allowed thread_level are 0 or 1 for now. Maybe more later...)
If -mt is activated (and WEBP_USE_THREAD is used for compile), the alpha-compression
will be done in parallel to RGB coding for lossy. Can save quite a bit of latency...
Has no effect for lossless encoding.

Change-Id: I769d0bf90e7380cf99344ad62cd77277f4df5a46
This commit is contained in:
skal
2013-03-01 01:21:34 +01:00
parent 72655350ea
commit f817930a55
9 changed files with 96 additions and 33 deletions
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6
man/cwebp.1
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@ -1,5 +1,5 @@
.\" Hey, EMACS: -*- nroff -*-
.TH CWEBP 1 "February 15, 2013"
.TH CWEBP 1 "February 28, 2013"
.SH NAME
cwebp \- compress an image file to a WebP file
.SH SYNOPSIS
@ -82,6 +82,10 @@ of JPEG compression. This flag will generally produce an output file of
similar size to its JPEG equivalent (for the same \fB\-q\fP setting), but
with less visual distortion.
.TP
.B \-mt
Use multi-threading for encoding, if possible. This option is only effective
when using lossy compression on a source with a transparency channel.
.TP
.B \-af
Turns auto-filter on. This algorithm will spend additional time optimizing
the filtering strength to reach a well-balanced quality.